Opened from the free fourth corner slot on the Alt key (switch_lights), closed
by the full-width Keyboard key. One key per light, registry-driven labels, so
the page renders whatever the lights-proxy reports rather than knowing any
entity ids. ON is blue, OFF is pink, anything unreachable is stale grey, and
the glyph flips between a lit lamp (0xE025) and an unlit twin (0xE026) so an
unreachable light can never look lit. Toggles are sent once and never retried.
Nyra
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